Abstract: A travelling wave optical parametric generator based on a ZnGeP$-2$/ crystal, pumped by an actively mode-locked Cr:Er:YSGG laser ($lambda $EQ 2.8 $mu@m) has been used for the study of non-linear-optical phenomena in (InGa)As/(AlGa)As and GaAs/(AlGa)As Multi Quantum Wells (MQWs) which had intersubband absorption features in the range $lambda approximately 4..10 $mu@m. Using a two-color pump-probe scheme a dynamic spectral hole burning effect has been observed for the first time, confirming the inhomogeneous nature of MQW absorption line broadening in these samples.!5
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机译：摘要：基于ZnGeP $ -2 $ /晶体的行波光学参量发生器由主动锁模Cr：Er：YSGG激光器（λlambdaEQ 2.8 $ mu @ m）泵浦，已用于研究（InGa）As /（AlGa）As和GaAs /（AlGa）As多量子阱（MQWs）中的非线性光学现象，其子带内吸收特征在$ lambda范围约4..10 $ mu @ m。使用双色泵浦探针方案，首次观察到动态光谱烧孔效果，确认了这些样品中MQW吸收谱线展宽的不均匀性！5
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